package com.hmy.equipment.rabbitMq;

import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;

import javax.websocket.OnClose;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteBuffer;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.CopyOnWriteArraySet;

@Component
@Slf4j
@ServerEndpoint("/websocket/{userId}")
public class WebSocket {
    /**
     * 线程安全的无序的集合
     */
    private static final CopyOnWriteArraySet<Session> SESSIONS = new CopyOnWriteArraySet<>();

    /**
     * 存储在线连接数
     */
    private static final Map<String, Session> SESSION_POOL = new HashMap<>();

    @OnOpen
    public void onOpen(Session session, @PathParam(value = "userId") String userId) {
        try {
            SESSIONS.add(session);
            SESSION_POOL.put(userId, session);
            log.info("【WebSocket消息】有新的连接，用户名为为：" + userId);
            log.info("【WebSocket消息】有新的连接，总数为：" + SESSIONS.size());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    @OnClose
    public void onClose(Session session) {
        try {
            SESSIONS.remove(session);
            log.info("【WebSocket消息】连接断开，总数为：" + SESSIONS.size());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    @OnMessage
    public void onMessage(String message,Session session) {
        log.info("【WebSocket消息】收到"+session.getId()+"消息：" + message);
    }

    /**
     * 此为广播消息
     *
     * @param message 消息
     */
    public void sendAllMessage(String message) {
        log.info("【WebSocket消息】广播消息：" + message);
        for (Session session : SESSIONS) {
            try {
                if (session.isOpen()) {
                    session.getAsyncRemote().sendText(message);
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

    }

    /**
     * 此为单点消息
     *
     * @param userId  用户编号
     * @param message 消息
     */
    public void sendOneMessage(String userId, String message) {
        Session session = SESSION_POOL.get(userId);
        if (session != null && session.isOpen()) {
            try {
                synchronized (session) {
                    log.info("【WebSocket消息】单点消息：" + message);
                    session.getAsyncRemote().sendText(message);
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

    /**
     * 此为单点消息(多人)
     *
     * @param userIds 用户编号列表
     * @param message 消息
     */
    public void sendMoreMessage(String[] userIds, String message) {
        for (String userId : userIds) {
            Session session = SESSION_POOL.get(userId);
            if (session != null && session.isOpen()) {
                try {
                    log.info("【WebSocket消息】单点消息：" + message);
                    session.getAsyncRemote().sendText(message);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }
    }

    /**
     * 此为单点流消息
     *
     * @param userId  用户编号
     * @param is 流
     */
    public void sendMoreMessageWithStream(String userId, InputStream is) {
        Session session = SESSION_POOL.get(userId);
        if (session != null && session.isOpen()) {
            try {
                ByteBuffer byteBuffer = convert(is);
                log.info("【WebSocket消息】流消息：");
                session.getAsyncRemote().sendBinary(byteBuffer);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

    }

    public static ByteBuffer convert(InputStream inputStream) throws IOException {
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();

        byte[] buffer = new byte[4096];
        int bytesRead;
        while ((bytesRead = inputStream.read(buffer)) != -1) {
            outputStream.write(buffer, 0, bytesRead);
        }

        byte[] data = outputStream.toByteArray();
        return ByteBuffer.wrap(data);
    }

}
